Reliability and Maintainability Engineering forms an essential part of achieving safe and successful missions.

Reliability Engineering comprises the set of activities aimed at assessment and improvement of reliability performance of systems during their missions. Maintainability Engineering consists of the assessments and verification of the system design characteristics so that the need for maintenance is minimized and downtime is minimized when maintenance action is necessary.

Through design evaluation, (probabilistic) modeling and analysis, and testing, these disciplines help establish the necessary confidence that the system and its components function as required when needed